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Discontinued Operations - Summary of Exceptional Items - Discontinued Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of discontinued operations [line items]      
Exceptional items gross $ (650) $ (763) $ (2,520)
Exceptional items tax (2,320) (243) (247)
Exceptional items net (2,970) (1,006) (2,767)
US tax reform [Member]      
Disclosure of discontinued operations [line items]      
Exceptional items gross (2,320)    
Exceptional items tax (2,320)    
Exceptional items net (2,320)    
Impairment of Onshore US assets [member]      
Disclosure of discontinued operations [line items]      
Exceptional items net     (4,884)
Non-controlling interests [Member]      
Disclosure of discontinued operations [line items]      
Exceptional items gross   (232)  
Exceptional items tax   68  
Exceptional items net   (164)  
Attributable to BHP shareholders [member]      
Disclosure of discontinued operations [line items]      
Exceptional items gross (650) (531) (2,520)
Exceptional items tax (2,320) (311) (247)
Exceptional items net (2,970) $ (842) (2,767)
Discontinued operations [member]      
Disclosure of discontinued operations [line items]      
Exceptional items gross (2,859)   (7,184)
Exceptional items tax 601   2,300
Exceptional items net (2,258)   (4,884)
Discontinued operations [member] | US tax reform [Member]      
Disclosure of discontinued operations [line items]      
Exceptional items tax 492    
Exceptional items net 492    
Discontinued operations [member] | Impairment of Onshore US assets [member]      
Disclosure of discontinued operations [line items]      
Exceptional items gross (2,859)   (7,184)
Exceptional items tax 109   2,300
Exceptional items net (2,750)   (4,884)
Discontinued operations [member] | Non-controlling interests [Member]      
Disclosure of discontinued operations [line items]      
Exceptional items gross     (80)
Exceptional items tax     29
Exceptional items net     (51)
Discontinued operations [member] | Attributable to BHP shareholders [member]      
Disclosure of discontinued operations [line items]      
Exceptional items gross (2,859)   (7,104)
Exceptional items tax 601   2,271
Exceptional items net $ (2,258)   $ (4,833)